Screw driver



FIG. 1 is a perspective view of the screw driver showing my new design;

FIG. 2 is a perspective view thereof with the driver bit shown in an alternate position;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a side elevational view thereof.

The driver bit has been omitted from FIGS. 3-6 for convenience of illustration only. 

The ornamental design for a screw driver, as shown and described. 